Add documentation for one-broker Kafka cluster for development

added modul/theodolite label

Should be configurable by #76 (closed)

mentioned in issue #76 (closed)

mentioned in merge request !60 (merged)

mentioned in commit 58e18b69

mentioned in commit f18363c9

mentioned in commit dbf0b71c

mentioned in commit 61adee80

closed with commit dbf0b71c

closed with commit 61adee80

mentioned in commit 53186249

closed with merge request !60 (merged)